Senior college student Tong Xi takes a part-time job cleaning a luxury mansion to make a living, and accidentally gets involved with a mysterious man. Afterward, she is shocked to realize that he is actually her school's aloof and noble distinguished professor, as well as Lu Jianshen, the CEO of the Lu family who holds a business empire. Caught between her younger brother's sky-high surgery fee for a critical illness and a sudden unexpected pregnancy, a desperate Tong Xi signs a marriage contract with Lu Jianshen.